Gas leakage prevention closing valve structure for high-pressure gas tank

Abstract

The utility model provides an anti-leakage closing valve structure for a high-pressure gas tank, which belongs to the technical field of gas filling and comprises a first connecting cylinder, the left side of the first connecting cylinder is hermetically connected with a gas inlet of the high-pressure gas tank, a second connecting cylinder is arranged on the right side of the first connecting cylinder, and a fixing frame is arranged at the right end of the inner side of the first connecting cylinder. A sealing valve is movably arranged in the second connecting cylinder, an abutting spring is arranged between the sealing valve and the fixing frame, a second boss is arranged on the side, close to the first connecting cylinder, in the second connecting cylinder, and the sealing valve keeps abutting against the second boss under the elastic force action of the abutting spring to isolate gas circulation at the two ends. And an exhaust hole penetrating to the outside is formed in the right side of the inner side of the second connecting cylinder. The problems that in the prior art, response hysteresis exists in a closing mechanism, and the emergency cut-off requirement is difficult to meet are solved.

Description

Technical Field

[0001] This utility model relates to the field of gas filling technology, and more specifically, to a leak-proof closing valve structure for high-pressure gas tanks. Background Technology

[0002] In the field of industrial gas storage and transportation, high-pressure gas tanks are the core storage devices for hazardous media such as compressed gases and liquefied gases. The reliability of their valve sealing systems directly determines the safety of storage and transportation and the efficiency of media preservation. Traditional high-pressure gas tanks generally use a rotary butterfly valve structure to open and close the filling port. This solution achieves sealing by manually tightening the valve stem to compress the sealing gasket. Although it has the advantages of simple structure and low cost, it has exposed significant defects in actual working conditions. When an emergency occurs, such as pipeline depressurization or sudden breakage after filling, the closing mechanism that relies on threaded contact has a response lag. Its closing action needs to rely on the pressure difference of the medium or manual intervention to complete, which is difficult to meet the mandatory requirements of national standards for emergency cut-off response time, and there is a risk of combustion and explosion caused by medium leakage. Utility Model Content

[0003] To overcome the above deficiencies, this utility model provides a leak-proof closing valve structure for high-pressure gas tanks to solve the aforementioned problems.

[0004] This utility model is implemented as follows:

[0005] A leak-proof closing valve structure for a high-pressure gas tank includes a first connecting cylinder, the left side of which is sealed to the air inlet of the high-pressure gas tank, and a second connecting cylinder on the right side of the first connecting cylinder. A fixing frame is provided at the inner right end of the first connecting cylinder. A sealing valve is movably disposed inside the second connecting cylinder, and an abutment spring is provided between the sealing valve and the fixing frame. A second protrusion is provided inside the second connecting cylinder on the side near the first connecting cylinder. The sealing valve is kept in contact with the second protrusion by the elastic force of the abutment spring, isolating the gas flow at both ends. An exhaust hole extending to the outside is opened on the inner right side of the second connecting cylinder.

[0006] In an embodiment of this utility model, the fixing frame includes a central cylinder disposed at the center of the first connecting cylinder, and a side fixing plate is disposed between the central cylinder and the inner sidewall of the first connecting cylinder.

[0007] In an embodiment of this utility model, the sealing valve includes a valve stem, a valve disc is provided on the left side of the valve stem, and a compression head is provided on the right side of the valve stem. The valve disc is located between the second boss and the fixing frame, and the compression head is located outside the second connecting cylinder. One end of the abutment spring is fixed at the gap between the central cylinder and the side fixing plate, and the other end is connected to the valve disc.

[0008] In an embodiment of this utility model, the valve disc has an arc-shaped surface structure that bends to the left on both sides, and the contact surface between the second boss and the valve disc is an arc-shaped surface, so that the two fit together completely when in contact.

[0009] In an embodiment of this utility model, there are four exhaust holes, which are circumferentially and equally distributed on the outside of the second connecting cylinder.

[0010] In an embodiment of this utility model, a first sealing ring is provided at the connection between the first connecting cylinder and the second connecting cylinder, a third protrusion is provided on the right side of the outer side of the second connecting cylinder, and a second sealing ring is provided on the right side of the third protrusion.

[0011] In an embodiment of this utility model, the diameter of the extrusion head is smaller than the inner diameter of the second connecting cylinder. A fourth protrusion is provided at the outer right end of the extrusion head, and a third sealing ring is provided on the left side of the fourth protrusion. When the sealing valve is extruded to the left, the fourth protrusion abuts against the end of the second connecting cylinder, and the third sealing ring abuts against the inner wall of the second connecting cylinder.

[0012] In an embodiment of this utility model, a protective cover is movably provided on the right side of the first connecting cylinder.

[0013] The beneficial effects of this utility model are as follows: This solution addresses the problem of delayed response in traditional high-pressure gas tank closing mechanisms by constructing an automatic sealing structure with a dual function of "spring pre-tensioning + gas pressure assistance". Under normal conditions, the sealing valve is subjected to the elastic force of the resisting spring, tightly fitting the arc-shaped sealing surface of the second boss to form an initial seal. When the male head is inserted, the external extrusion force pushes the valve stem to the left to compress the spring, causing the valve disc to separate from the second boss and form a gas channel. At this time, high-pressure gas flows from the gap of the fixing frame through the exhaust hole into the male head. The moment the male head is pulled out, the spring immediately drives the sealing valve to reset, and at the same time, the gas pressure inside the tank assists in pushing the valve disc to achieve secondary compression with the second boss, thereby breaking through the second-level limitation of traditional structures in response time. Attached Figure Description

[0014] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0015] Figure 1 A schematic diagram of the anti-leakage closing valve structure provided for an embodiment of this utility model;

[0016] Figure 2A cross-sectional view of the anti-leakage closing valve structure provided for an embodiment of this utility model;

[0017] Figure 3 A cross-sectional view of an embodiment provided for the present utility model.

[0018] In the diagram: 10, First connecting cylinder; 11, First boss; 12, Fixing frame; 1201, Center cylinder; 1202, Side fixing plate; 20, Second connecting cylinder; 21, Second boss; 22, Vent hole; 23, Sealing valve; 2301, Valve stem; 2302, Valve disc; 2303, Extrusion head; 24, Third boss; 30, Contact spring; 40, First sealing ring; 50, Second sealing ring; 60, Third sealing ring; 70, Protective cover. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0021] like Figure 1-2As shown, this utility model provides a leak-proof closing valve structure for a high-pressure gas tank, including a first connecting cylinder 10. The left side of the first connecting cylinder 10 is sealed to the air inlet of the high-pressure gas tank. A second connecting cylinder 20 is provided on the right side of the first connecting cylinder 10. A fixing frame 12 is provided at the inner right end of the first connecting cylinder 10. A sealing valve 23 is movably disposed inside the second connecting cylinder 20. A retaining spring 30 is provided between the sealing valve 23 and the fixing frame 12. A second boss 21 is provided inside the second connecting cylinder 20 near the first connecting cylinder 10. The sealing valve 23 is held in place by the elastic force of the retaining spring 30 against the second boss 21. 1. To prevent gas flow at both ends, the second connecting cylinder 20 has an exhaust port 22 extending to the outside on the right side of its inner side. This solution adopts a common gas cylinder female-male coupling filling structure, that is, the leak-proof closing valve structure is set on the side of the rotary butterfly valve of the high-pressure gas pipe. Through the design of the female head, the sealing valve 23 is quickly closed by means of spring and internal gas pressure. The original rotary butterfly valve structure of the high-pressure gas cylinder is combined with the female head design of the leak-proof closing valve structure, which can meet the emergency cut-off needs of frequent use in a short period of time, and can also close the rotary butterfly valve structure when not in use for a long time to achieve two-stage sealing, which is safer.

[0022] In this embodiment, the fixing frame 12 includes a central cylinder 1201 disposed at the center of the first connecting cylinder 10. A side fixing plate 1202 is disposed between the central cylinder 1201 and the inner side wall of the first connecting cylinder 10. The central cylinder 1201 and the side fixing plate 1202 facilitate the flow of gas from the fixing frame 12. At the same time, the gap formed between the two helps to fix the abutment spring 30, making the force on the center of the sealing valve 23 more stable.

[0023] Furthermore, the sealing valve 23 includes a valve stem 2301, a valve disc 2302 is provided on the left side of the valve stem 2301, and a compression head 2303 is provided on the right side of the valve stem 2301. The valve disc 2302 is located between the second boss 21 and the fixing frame 12, and the compression head 2303 is located outside the second connecting cylinder 20. One end of the abutment spring 30 is fixed in the gap between the central cylinder 1201 and the side fixing plate 1202, and the other end is connected to the valve disc 2302.

[0024] In this embodiment, the valve disc 2302 has an arc-shaped surface structure that bends to the left on both sides, and the contact surface between the second boss 21 and the valve disc 2302 is an arc-shaped surface, so that the two fit together completely when in contact.

[0025] In this embodiment, there are four exhaust ports 22, which are evenly distributed around the outside of the second connecting cylinder 20. The exhaust ports are channels for injecting / receiving gas into the male connector.

[0026] In this embodiment, a first sealing ring 40 is provided at the connection between the first connecting cylinder 10 and the second connecting cylinder 20, a third boss 24 is provided on the right side of the outer side of the second connecting cylinder 20, and a second sealing ring 50 is provided on the right side of the third boss 24.

[0027] Furthermore, the diameter of the extrusion head 2303 is smaller than the inner diameter of the second connecting cylinder 20. A fourth protrusion is provided at the outer right end of the extrusion head 2303. A third sealing ring 60 is provided on the left side of the fourth protrusion. When the sealing valve 23 is extruded to the left, the fourth protrusion abuts against the end of the second connecting cylinder 20, and the third sealing ring 60 abuts against the inner wall of the second connecting cylinder 20.

[0028] It should be noted that in this design, the outer right side of the first connecting cylinder 10 to the right end of the second connecting cylinder 20 is a standard female head design. That is, when the opposite male head is inserted into the outer side of the leak-proof closing valve, the first sealing ring 40 and the second sealing ring 50 respectively abut against the inner wall of the male head for sealing. At the same time, the inside of the male head compresses the extrusion head 2303, causing the fourth boss to abut against the right end of the second connecting cylinder 20, and the third sealing ring 60 to abut against the inner wall of the second connecting cylinder 20. At this time, the valve disc 2302 compresses the contact spring 30, and the gas inside the high-pressure gas tank passes through the fixing bracket 12 and then enters the male head through the exhaust port 22.

[0029] In one embodiment, such as Figure 3 As shown, a protective cover 70 is movably provided on the right side of the first connecting cylinder 10. Specifically, a first boss 11 is provided on the outside of the first connecting cylinder 10, and a threaded structure is provided on the outside of the second connecting cylinder 20. The protective cover 70 is threadedly connected to the outside of the second connecting cylinder 20. After being fully tightened, the protective cover 70 abuts against the first boss 11. The protective cover 70 ensures that the anti-leakage closing valve structure plays a protective role when it is not used for a long time, reducing the possibility of leakage caused by external pressure.

[0030] Specifically, the working principle of this leak-proof closing valve structure for high-pressure gas cylinders is as follows: First, unscrew the rotary butterfly valve structure on top of the high-pressure gas cylinder. Then, insert the male connector. The male connector compresses the compression head 2303 of the sealing valve 23, causing the valve disc 2302 to move to the left and separate from the second protrusion 21. The gap formed allows gas to flow through the exhaust port 22 to the other end of the male connector. After removing the male connector, the sealing valve 23 moves to the right under the action of the resisting spring 30 until it fits against the second protrusion 21. Simultaneously, the gas pressure inside the high-pressure gas cylinder acts on the valve disc 2302, making it fit more tightly against the second protrusion 21, thus ensuring its sealing performance. This structure solves the problem of lag in response of existing closing mechanisms, which makes it difficult to meet emergency shut-off requirements.

[0031] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A leak-proof closing valve structure for high-pressure gas tanks, characterized in that, The device includes a first connecting cylinder (10), the left side of which is sealed to the air inlet of the high-pressure gas tank. A second connecting cylinder (20) is provided on the right side of the first connecting cylinder (10). A fixing frame (12) is provided on the right end of the inner side of the first connecting cylinder (10). A sealing valve (23) is movably provided inside the second connecting cylinder (20). A contact spring (30) is provided between the sealing valve (23) and the fixing frame (12). A second boss (21) is provided on the side of the second connecting cylinder (20) near the first connecting cylinder (10). The sealing valve (23) is kept in contact with the second boss (21) by the elastic force of the contact spring (30) to isolate the gas flow at both ends. An exhaust hole (22) is opened on the right side of the inner side of the second connecting cylinder (20) to the outside.

2. The anti-leakage closing valve structure for a high-pressure gas tank according to claim 1, characterized in that, The fixing frame (12) includes a central cylinder (1201) disposed at the center of the first connecting cylinder (10), and a side fixing plate (1202) is disposed between the central cylinder (1201) and the inner side wall of the first connecting cylinder (10).

3. The anti-leakage closing valve structure for a high-pressure gas tank according to claim 2, characterized in that, The sealing valve (23) includes a valve stem (2301), a valve disc (2302) is provided on the left side of the valve stem (2301), and a pressing head (2303) is provided on the right side of the valve stem (2301). The valve disc (2302) is located between the second boss (21) and the fixing frame (12). The pressing head (2303) is located outside the second connecting cylinder (20). One end of the abutment spring (30) is fixed at the gap between the central cylinder (1201) and the side fixing plate (1202), and the other end is connected to the valve disc (2302).

4. The anti-leakage closing valve structure for a high-pressure gas tank according to claim 3, characterized in that, The valve disc (2302) has an arc-shaped surface structure that bends to the left on both sides. The contact surface between the second boss (21) and the valve disc (2302) is an arc-shaped surface, and the two fit together completely when in contact.

5. The anti-leakage closing valve structure for a high-pressure gas tank according to claim 4, characterized in that, There are four exhaust holes (22), which are evenly distributed around the outside of the second connecting cylinder (20).

6. The anti-leakage closing valve structure for a high-pressure gas tank according to claim 1, characterized in that, A first sealing ring (40) is provided at the connection between the first connecting cylinder (10) and the second connecting cylinder (20). A third boss (24) is provided on the right side of the outer side of the second connecting cylinder (20), and a second sealing ring (50) is provided on the right side of the third boss (24).

7. The anti-leakage closing valve structure for a high-pressure gas tank according to claim 3, characterized in that, The diameter of the extrusion head (2303) is smaller than the inner diameter of the second connecting cylinder (20). A fourth protrusion is provided on the right side of the outer side of the extrusion head (2303). A third sealing ring (60) is provided on the left side of the fourth protrusion. When the sealing valve (23) is extruded to the left, the fourth protrusion abuts against the end of the second connecting cylinder (20), and the third sealing ring (60) abuts against the inner wall of the second connecting cylinder (20).

8. The anti-leakage closing valve structure for a high-pressure gas tank according to claim 1, characterized in that, A protective cover (70) is movably provided on the right side of the first connecting cylinder (10).

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